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Additional Information - Summary of Movement in Capitalised Exploratory Well Costs (Detail) - Exploration and evaluation assets [member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Detailed Information About Exploration And Evaluation [Line Items]      
At the beginning of the year $ 614 $ 2,045 $ 3,809
Acquisition to the capitalised exploratory well costs pending the determination of proved reserves 180    
Additions to the capitalised exploratory well costs pending the determination of proved reserves 111 501 399
Capitalised exploratory well costs expensed (62) (268) (1,571)
Capitalised exploratory well costs reclassified to wells, equipment and facilities based on the determination of proved reserves (36) (1,664) (592)
Sale of suspended wells 0    
At the end of the year $ 807 $ 614 $ 2,045